[gtk] (12 commits) Non-fast-forward update to branch prop-list

[Matthias Clasen <matthiasc src gnome org>]

The branch 'prop-list' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  a5a88d6... Cosmetics
  8ab8c7e... inspector: Use a column view for the property list
  dcabe03... Add GtkSorter
  0c734ef... Redo sort list model with GtkSorter
  ba44963... column view: add sort model and sorter properties
  04d63c8... column view column: Add a sorter property
  42ce1b7... column view title: Add sort indicators
  9c3eb9e... inspector: Make prop list sortable again
  bdb80c7... Redo inverted sorting
  ab4c499... Add GtkColumnViewSorter
  ca99cbd... column view: Add a sort-by api

Commits added to the branch:

  12ee06a... filter: Update tests
  5317df6... Cosmetics
  772d473... filter: Small doc tweaks
  14e24b9... Add GtkSorter
  a68c706... Redo sort list model with GtkSorter
  0952a6a... column view: Add some helpers
  529018d... Add GtkColumnViewSorter
  f96b19a... column view: add sort model and sorter properties
  5705c7b... column view column: Add a sorter property
  a01352e... column view title: Show sort indicators
  c655912... column view: Add a sort-by api
  021547b... inspector: Use a column view for the property list